feat(skills): add deepsearch skill #802
Description
Purpose
Multi-pass thorough codebase search — when simple grep/glob isn't enough, systematically explore across multiple naming conventions, file patterns, and abstraction layers.
Changes
packages/rules/.ai-rules/skills/deepsearch/SKILL.md— New skill
Acceptance Criteria
- SKILL.md created with codingbuddy pattern
- Multi-pass strategy: exact match → fuzzy → semantic → cross-reference
- Covers: naming convention variations, import chain tracing, dead code detection
- v2.0 frontmatter included
- Can be merged independently